\documentclass{standalone}

\usepackage{graphicx}

\begin{document}
\begin{tabular}{cc}
\raisebox{-.5\height}{\includegraphics[width=1in]{../results/temp/la_bc.png}} & 
\raisebox{-.5\height}{\includegraphics[width=1in]{../results/temp/la_ch.png}} \\  \vspace{0.2cm}
\footnotesize ReockPT=0.26 & \footnotesize  CvxHullPT=0.44  \\
\raisebox{-.5\height}{\includegraphics[width=1in]{../results/temp/la_sbc.png}} & 
\raisebox{-.5\height}{\includegraphics[width=1in]{../results/temp/la_sch.png}} \\
\footnotesize ReockPS=0.26 & \footnotesize  CvxHullPS=0.58
\end{tabular}
\end{document}